546
FNCA52 TJSJ 290913
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
513 AM AST MON DEC 29 2025
DISCUSSION
DRYING CONDITIONS CONTINUE, ESPECIALLY ACROSS SOUTHERN PUERTO
RICO, WHERE MINIMUM RELATIVE HUMIDITY HAS FALLEN BELOW 40% FOR A
SECOND CONSECUTIVE DAY, WITH SOME LOCATIONS DROPPING INTO THE 20S
TO 30S. WINDS REMAIN LIGHT, LIMITING FIRE SPREAD AT THIS TIME.
KBDI VALUES CONTINUE TO INCREASE, WITH CABO ROJO EXCEEDING FIRE
DANGER THRESHOLDS (ABOVE 550) AND CAMP SANTIAGO APPROACHING
SIMILAR LEVELS, INDICATING INCREASINGLY DRY FUELS. WHILE NO
SIGNIFICANT FIRE WEATHER THREAT IS EXPECTED TODAY, CONTINUED
DRYING THROUGH MID TO LATE WEEK WARRANTS CLOSE MONITORING,
PARTICULARLY AS STRONGER WINDS ARE POSSIBLE FRIDAY INTO SATURDAY,
WHICH COULD ELEVATE FIRE SPREAD POTENTIAL IF DRY CONDITIONS
PERSIST.
PRZ014-301000-
SOUTHEAST COASTAL PLAINS-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 20 20 0
TEMP (24H TREND) 83 (0) 64 (0) 83
RH % (24H TREND) 44 (-3) 96 (+9) 47
WIND 20FT/EARLY(MPH) E 13 G17 NE 12 SE 12
WIND 20FT/LATE(MPH) E 13 G17 NE 12 SE 12
MIXING HGT(FT-AGL/MSL)5370 4480
TRANSPORT WND (MPH) E 7 E 9
VENT RATE (KT-FT) 32220 35840
DISPERSION 5 5
DSI 6 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-301000-
SOUTHERN HILLS-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 0
TEMP (24H TREND) 79 (+2) 61 (-1) 81
RH % (24H TREND) 55 (-5) 97 (+4) 58
WIND 20FT/EARLY(MPH) E 10 NE 8 SE 10
WIND 20FT/LATE(MPH) E 10 NE 8 SE 10
MIXING HGT(FT-AGL/MSL)5460 4790
TRANSPORT WND (MPH) E 7 SE 8
VENT RATE (KT-FT) 32760 33530
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-301000-
NORTH COASTAL PLAINS-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 0
TEMP (24H TREND) 81 (0) 64 (-2) 83
RH % (24H TREND) 57 (-3) 97 (+11) 57
WIND 20FT/EARLY(MPH) NE 11 E 11 E 11
WIND 20FT/LATE(MPH) NE 11 E 11 E 11
MIXING HGT(FT-AGL/MSL)4900 4870
TRANSPORT WND (MPH) E 8 SE 7
VENT RATE (KT-FT) 34300 29220
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-301000-
NORTHERN HILLS-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 30
TEMP (24H TREND) 80 (+1) 62 (-1) 82
RH % (24H TREND) 56 (-2) 97 (+6) 56
WIND 20FT/EARLY(MPH) NE 10 E 9 NE 9
WIND 20FT/LATE(MPH) NE 10 E 9 NE 9
MIXING HGT(FT-AGL/MSL)5340 5420
TRANSPORT WND (MPH) E 6 SE 5
VENT RATE (KT-FT) 26700 21680
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-301000-
WEST COAST-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 82 (-1) 64 (0) 83
RH % (24H TREND) 52 (-4) 94 (+7) 58
WIND 20FT/EARLY(MPH) SE 10 E 11 SE 12
WIND 20FT/LATE(MPH) SE 10 E 11 SE 12
MIXING HGT(FT-AGL/MSL)4890 4780
TRANSPORT WND (MPH) SE 6 SE 8
VENT RATE (KT-FT) 24450 33460
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-301000-
EASTERN INTERIOR-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10
TEMP (24H TREND) 80 (+1) 62 (-2) 82
RH % (24H TREND) 62 (0) 98 (+7) 59
WIND 20FT/EARLY(MPH) E 10 E 9 SE 10
WIND 20FT/LATE(MPH) E 10 E 9 SE 10
MIXING HGT(FT-AGL/MSL)5490 4690
TRANSPORT WND (MPH) E 8 SE 8
VENT RATE (KT-FT) 38430 32830
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-301000-
LUQUILLO MOUNTAIN RANGE-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 10
TEMP (24H TREND) 76 (+3) 62 (-2) 77
RH % (24H TREND) 68 (-2) 99 (+5) 64
WIND 20FT/EARLY(MPH) E 8 E 6 SE 9
WIND 20FT/LATE(MPH) E 8 E 6 SE 9
MIXING HGT(FT-AGL/MSL)4740 4310
TRANSPORT WND (MPH) E 9 SE 9
VENT RATE (KT-FT) 37920 34480
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-301000-
CENTRAL MOUNTAIN RANGE-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 30
TEMP (24H TREND) 78 (+3) 59 (-1) 80
RH % (24H TREND) 56 (-7) 100 (+4) 56
WIND 20FT/EARLY(MPH) E 6 E 8 SE 8
WIND 20FT/LATE(MPH) E 6 E 8 SE 8
MIXING HGT(FT-AGL/MSL)5920 5700
TRANSPORT WND (MPH) SE 3 SE 3
VENT RATE (KT-FT) 17760 17100
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-301000-
CAYEY MOUNTAIN RANGE-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 10
TEMP (24H TREND) 75 (0) 61 (-1) 77
RH % (24H TREND) 67 (+3) 99 (+3) 64
WIND 20FT/EARLY(MPH) E 9 E 6 SE 8
WIND 20FT/LATE(MPH) E 9 E 6 SE 8
MIXING HGT(FT-AGL/MSL)5340 4390
TRANSPORT WND (MPH) E 10 E 9
VENT RATE (KT-FT) 48060 35120
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-301000-
VIEQUES-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 10
TEMP (24H TREND) 81 (0) 70 (0) 81
RH % (24H TREND) 59 (+3) 83 (-4) 56
WIND 20FT/EARLY(MPH) E 11 E 11 SE 10
WIND 20FT/LATE(MPH) E 11 E 11 SE 10
MIXING HGT(FT-AGL/MSL)4190 4530
TRANSPORT WND (MPH) NE 13 E 12
VENT RATE (KT-FT) 46090 45300
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-301000-
CULEBRA-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 10
TEMP (24H TREND) 81 (0) 71 (-1) 82
RH % (24H TREND) 60 (+2) 83 (-2) 58
WIND 20FT/EARLY(MPH) E 10 E 12 SE 10
WIND 20FT/LATE(MPH) E 10 E 12 SE 10
MIXING HGT(FT-AGL/MSL)3870 4490
TRANSPORT WND (MPH) NE 13 E 12
VENT RATE (KT-FT) 42570 44900
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-301000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 84 (+1) 65 (-1) 83
RH % (24H TREND) 44 (-3) 94 (+11) 47
WIND 20FT/EARLY(MPH) SE 12 G17 E 10 SE 16 G21
WIND 20FT/LATE(MPH) SE 12 G17 E 10 SE 16 G21
MIXING HGT(FT-AGL/MSL)5250 4720
TRANSPORT WND (MPH) SE 7 SE 13
VENT RATE (KT-FT) 31500 51920
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-301000-
SAINT THOMAS AND SAINT JOHN-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 40 10 0
TEMP (24H TREND) 79 (-1) 70 (-1) 81
RH % (24H TREND) 62 (+3) 83 (-4) 58
WIND 20FT/EARLY(MPH) E 10 E 11 SE 11
WIND 20FT/LATE(MPH) E 10 E 11 SE 11
MIXING HGT(FT-AGL/MSL)3670 4630
TRANSPORT WND (MPH) E 13 E 12
VENT RATE (KT-FT) 40370 46300
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-301000-
ST CROIX-
513 AM AST MON DEC 29 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 81 (0) 71 (-1) 81
RH % (24H TREND) 60 (+4) 81 (-1) 58
WIND 20FT/EARLY(MPH) E 10 E 10 SE 11
WIND 20FT/LATE(MPH) E 10 E 10 SE 11
MIXING HGT(FT-AGL/MSL)4630 4300
TRANSPORT WND (MPH) E 10 E 13
VENT RATE (KT-FT) 41670 47300
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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